Lenses Recap quiz

The physics principle that enables the function of lenses is _______

• Reflection

• Refraction

• Total Internal Reflection

• Spectrum of White Light

A converging lens is a _____ lens while a diverging lens is a _____ lens.

• convex, concave

• convex, convex

• concave, convex

• concave, concave

All light that originates from the same point will converge at the ________ after passing through a converging lens.

• principal axis

• principal focus

• focal plane

• focal point

The principal axis of the lens must intersect with the o______ c_____ of the lens. (Spell out the full phrase in lowercase)

Which of the following are principal rays that you should draw to help you locate an image? Select all that apply

• A ray that passes through the optical centre

• A ray that is parallel to the principal axis

• A ray that passes through principal focus F before the lens

• A ray that passes through twice the focal length 2F before the lens

In the context of converging lenses, what are some clues that tell you that an image is virtual? Select all that apply

• The image is the same orientation as the object

• The image cannot be projected on a screen

• The light rays have to be extrapolated to find where the image will appear to be

• The image is on the same side as the object

A device with a converging lens produces an image is enlarged and real. What could this device be? Select all that apply.

• Spectacle Lens

• Microscope

• Photocopier

• Magnifying Glass

Find and draw the image. Note down the characteristics of the image for the next question.

In the previous question, how can you describe the image? Select all that apply.

• same size

• magnified

• upright

• inverted

If the question gives you the position of the object and F of a converging lens, how can you find the characteristics of the image? Select all that apply.

• Memorise the table with all six possibilities.

• Draw the scenario out to scale.

Answer explanation

Both ways are valid, but the second way will not require as much memory work for you.